For example, やらなければならない can modify 時 to form やらなければならない時 and I know that the adjective い ending can simply have a noun appended after it.
However when it's contracted to やらなきゃ can I simply add a noun after it and pretend that the ない ending still exists even though it has been contracted and elided? Will it still maintain the meaning of "(The) time where you must act" or will なきゃ be forced to take on the meaning of "unless" as in a similar manner reflected in the answer to Difference between ~なきゃ and ~なくちゃ?